9 Planets, message for you, I have an interesting update. The code mentioned above, to disable the heartbeat, was added directly to my functions.php file, but had no effect.
However, just as an experiment, I took that code back out of my functions.php file, which was nested under my CHILD theme folder, and instead, added it to my functions.php in the parent theme. Normally I’d never change that file, but I’m desperate.
Added the code to the parent functions.php file, saved, and for the last hour, I’ve updated 10-15 posts without a single disconnect, delay, or excessive ajax fetch. No high processes on my panel, but still waiting for the CPU Use spike to come down when it next refreshes on the server.
I have not been able to save more than one post in a single day, with this heartbeat issue. Now, I’ve edited and saved over a dozen in the last hour alone without any ill effects.
Site still loading a little slower than usual, but fingers crossed … if I have to manually update that code in the parent functions.php file, until any kind of glitch in the plug-in is discovered, or other hitch, so be it.